In lavage from patients with pneumonia, IL-22 concentrations were unrelated to total percentages of lymphocytes, macrophages, neutrophils, eosinophils and to the CD4 to CD8 T cell ratio (Table 3, p = 0.5, 0.98, 0.86, 0.98, 0.65, respectively). This evidence concerns the gene CD4 and susceptibility to pneumonia measurement.